19990465 has 8 divisors (see below), whose sum is σ = 26169408. Its totient is φ = 14538480.

The previous prime is 19990459. The next prime is 19990499. The reversal of 19990465 is 56409991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19990465 - 2³ = 19990457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181677 + ... + 181786.

It is an arithmetic number, because the mean of its divisors is an integer number (3271176).

Almost surely, 2^19990465 is an apocalyptic number.

It is an amenable number.

19990465 is a deficient number, since it is larger than the sum of its proper divisors (6178943).

19990465 is a wasteful number, since it uses less digits than its factorization.

19990465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363479.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 19990465 is about 4471.0697825017. The cubic root of 19990465 is about 271.3986181826.

The spelling of 19990465 in words is "nineteen million, nine hundred ninety thousand, four hundred sixty-five".